987490769 has 6 divisors (see below), whose sum is σ = 989513490. Its totient is φ = 985471040.

The previous prime is 987490759. The next prime is 987490787. The reversal of 987490769 is 967094789.

It can be written as a sum of positive squares in only one way, i.e., 562306369 + 425184400 = 23713^2 + 20620^2 .

It is not a de Polignac number, because 987490769 - 2¹⁶ = 987425233 is a prime.

It is a super-2 number, since 2×987490769² = 1950276037720422722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987490739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 957284 + ... + 958314.

It is an arithmetic number, because the mean of its divisors is an integer number (164918915).

Almost surely, 2^987490769 is an apocalyptic number.

It is an amenable number.

987490769 is a deficient number, since it is larger than the sum of its proper divisors (2022721).

987490769 is an frugal number, since it uses more digits than its factorization.

987490769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 59.

The square root of 987490769 is about 31424.3658488123. The cubic root of 987490769 is about 995.8127477235.

The spelling of 987490769 in words is "nine hundred eighty-seven million, four hundred ninety thousand, seven hundred sixty-nine".